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公开(公告)号：US2812769A
公开(公告)日：1957-11-12
申请号：US50647755
申请日：1955-05-06
Applicant: ENGINEERING DEV CORP
Inventor： SCHAEFER ERNEST R , KESSLER HARRY L
IPC: E04H15/20
CPC classification number: E04H15/20 , E04H2015/201 , E04H2015/206 , Y10S425/014
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